src/modules/m_connflood.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2008 InspIRCd Development Team
   6  * See: http://www.inspircd.org/wiki/index.php/Credits
   7  *
   8  * This program is free but copyrighted software; see
   9  *            the file COPYING for details.
  10  *
  11  * ---------------------------------------------------
  12  */
  13
  14 #include "inspircd.h"
  15
  16 /* $ModDesc: Connection throttle */
  17
  18 int conns = 0, throttled = 0;
  19
  20 class ModuleConnFlood : public Module
  21 {
  22 private:
  23         int seconds, maxconns, timeout, boot_wait;
  24         time_t first;
  25         std::string quitmsg;
  26
  27         ConfigReader* conf;
  28
  29
  30 public:
  31         ModuleConnFlood(InspIRCd* Me) : Module(Me)
  32         {
  33
  34                 InitConf();
  35                 Implementation eventlist[] = { I_OnRehash, I_OnUserRegister };
  36                 ServerInstance->Modules->Attach(eventlist, this, 2);
  37         }
  38
  39         virtual ~ModuleConnFlood()
  40         {
  41         }
  42
  43         virtual Version GetVersion()
  44         {
  45                 return Version(1,2,0,0,VF_VENDOR,API_VERSION);
  46         }
  47
  48
  49         void InitConf()
  50         {
  51                 /* read configuration variables */
  52                 conf = new ConfigReader(ServerInstance);
  53                 /* throttle configuration */
  54                 seconds = conf->ReadInteger("connflood", "seconds", 0, true);
  55                 maxconns = conf->ReadInteger("connflood", "maxconns", 0, true);
  56                 timeout = conf->ReadInteger("connflood", "timeout", 0, true);
  57                 quitmsg = conf->ReadValue("connflood", "quitmsg", 0);
  58
  59                 /* seconds to wait when the server just booted */
  60                 boot_wait = conf->ReadInteger("connflood", "bootwait", 0, true);
  61
  62                 first = ServerInstance->Time();
  63         }
  64
  65         virtual int OnUserRegister(User* user)
  66         {
  67                 time_t next = ServerInstance->Time();
  68
  69                 if ((ServerInstance->startup_time + boot_wait) > next)
  70                         return 0;
  71
  72                 /* time difference between first and latest connection */
  73                 time_t tdiff = next - first;
  74
  75                 /* increase connection count */
  76                 conns++;
  77
  78                 if (throttled == 1)
  79                 {
  80                         if (tdiff > seconds + timeout)
  81                         {
  82                                 /* expire throttle */
  83                                 throttled = 0;
  84                                 ServerInstance->SNO->WriteToSnoMask('A', "Connection throttle deactivated");
  85                                 return 0;
  86                         }
  87
  88                         ServerInstance->Users->QuitUser(user, quitmsg);
  89                         return 1;
  90                 }
  91
  92                 if (tdiff <= seconds)
  93                 {
  94                         if (conns >= maxconns)
  95                         {
  96                                 throttled = 1;
  97                                 ServerInstance->SNO->WriteToSnoMask('A', "Connection throttle activated");
  98                                 ServerInstance->Users->QuitUser(user, quitmsg);
  99                                 return 1;
 100                         }
 101                 }
 102                 else
 103                 {
 104                         conns = 1;
 105                         first = next;
 106                 }
 107                 return 0;
 108         }
 109
 110         virtual void OnRehash(User* user, const std::string &parameter)
 111         {
 112                 InitConf();
 113         }
 114
 115 };
 116
 117 MODULE_INIT(ModuleConnFlood)